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Killer whales () have been documented to prey on white sharks (), in some cases causing localised shark displacement and triggering ecological cascades. Notably, a series of such predation events have been reported from South Africa over the last decade, with killer whales specifically targeting sharks' liver. However, observations of these interactions are rare, and knowledge of their frequency across the world's oceans remains limited.
View Article and Find Full Text PDFStress-Easing Effect of Diacyl Glyceryl Ethers on Anxiety-Related Behavior in Mice.
Foods
November 2024
Department of Psychology, Graduate School of Arts and Letters, Tohoku University, Kawauchi 27-1, Aoba-ku, Sendai 980-8576, Miyagi, Japan.
Stress and anxiety are significant psychological challenges in modern society, which have led to a rapidly growing market for functional foods, including those reported to relieve stress, as alternatives to psychoactive drugs. Among these, diacyl glyceryl ethers (DAGE) derived from deep-sea shark liver oil have gained attention for their strong antioxidant properties and potential mental health benefits. Building on preliminary evidence suggesting DAGE's efficacy in enhancing stress resilience and modulating biochemical pathways associated with reduced oxidative stress, the present study aimed to examine their effects on stress responses in two specific mouse strains.
View Article and Find Full Text PDFEssential and non-essential elements in the endemic Peppered catshark Galeus piperatus of deep-ocean waters from northern Gulf of California: Baseline levels and Se ratios.
Mar Pollut Bull
December 2024
Unidad Académica de Ingeniería Ambiental y Sustentabilidad, Universidad Politécnica de Sinaloa, Carretera Municipal Libre Mazatlán-Higueras km. 3, C.P. 82199 Mazatlán, Sinaloa, Mexico. Electronic address:
In this study the levels of As, Cd, Cu, Hg, Pb, Se, Zn and Se:Hg molar ratios, in muscle and liver of the endemic catshark Galeus piperatus from the northern Gulf of California (NGC) and relationships with biological parameters, were determined. Arsenic presented the highest levels for both tissues and Pb the lowest. The Se:Hg molar ratios were >1.
View Article and Find Full Text PDFImmunological resilience of a temperate catshark to a simulated marine heatwave.
J Exp Biol
November 2024
Comparative Molecular and Integrative Biology, Centro de Ciências do Mar, Universidade do Algarve, 8005-139 Faro, Portugal.
Marine heatwaves (MHWs) have recently been proposed to be more relevant in driving population changes than the continuous increase in average temperatures associated with climate change. The causal processes underpinning MHW effects in sharks are unclear but may be linked to changes in fitness caused by physiological trade-offs that influence the immune response. Considering the scarcity of data about the immune response of sharks under anomalous warming events, the present study analyzed several fitness indices and characterized the immune response (in the blood, epigonal organ, liver, spleen and intestine) of temperate adult small-spotted catsharks (Scyliorhinus canicula) after a 30 day exposure to a category II MHW.
View Article and Find Full Text PDFExplicating the multifunctional roles of tocotrienol and squalene in promoting skin health.
Skin Health Dis
October 2024
Article Synopsis
- The skin is the largest organ and protects against threats like UV rays, infections, and injuries, but can develop disorders like acne and eczema due to various causes.
- Approximately one-third of the global population is affected by skin conditions, which can worsen with age and UV exposure, leading to issues like pigmentation and wrinkles.
- Recent studies highlight the benefits of natural antioxidants like tocotrienols (from sources like rice bran and olives) and squalene (from fish liver oils) for skin health, showing promise in treating skin disorders and improving overall skin condition.
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